Under the topic, "Use of exponents to express small numbers in standard form", the following facts are stated:
1. The speed of light is 300000000 m/sec.
2. The height of the Mount Everest is 8848 m.
3. The diameter of a wire on a computer chip is 0.000003 m.
4. The size of a plant cell is 0.00001275 m.
The above examples are used to express each stated number in standard form. Use of such examples

Options

A. shows the accuracy aspect of numbers
B. reflects the inter-disciplinary approach
C. is made in class to grab the attention of students more interested in science
D. helps the teacher to identify the bright students

Answer

To express the given numbers in standard form, we will convert each number into a format that uses exponents. The standard form (or scientific notation) is typically expressed as \( a \times 10^n \), where \( 1 \leq a < 10 \) and \( n \) is an integer.

### Step-by-Step Solution:

1. **Speed of Light: 300,000,000 m/sec**
- To convert this to standard form, we can express it as:
\[ 300,000,000 = 3.0 \times 10^8 \]
- **Hint:** Move the decimal point 8 places to the left to get a number between 1 and 10.

2. **Height of Mount Everest: 8,848 m**
- Convert this to standard form:
\[ 8,848 = 8.848 \times 10^3 \]
- **Hint:** Move the decimal point 3 places to the left to get a number between 1 and 10.

3. **Diameter of a Wire on a Computer Chip: 0.000003 m**
- Convert this to standard form:
\[ 0.000003 = 3.0 \times 10^{-6} \]
- **Hint:** Move the decimal point 6 places to the right to express it as a positive number multiplied by a negative power of ten.

4. **Size of a Plant Cell: 0.00001275 m**
- Convert this to standard form:
\[ 0.00001275 = 1.275 \times 10^{-5} \]
- **Hint:** Move the decimal point 5 places to the right to express it in standard form.

### Summary of Results:
- Speed of Light: \( 3.0 \times 10^8 \) m/sec
- Height of Mount Everest: \( 8.848 \times 10^3 \) m
- Diameter of Wire: \( 3.0 \times 10^{-6} \) m
- Size of Plant Cell: \( 1.275 \times 10^{-5} \) m